Microanchored borehole fiber optics allows strain profiling of the shallow subsurface

Abstract Vertical deformation profiles of subterranean geological formations are conventionally measured by borehole extensometry. Distributed strain sensing (DSS) paired with fiber-optic cables installed in the ground opens up possibilities for acquiring high-resolution static and quasistatic strai...

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Autores principales:	Cheng-Cheng Zhang, Bin Shi, Song Zhang, Kai Gu, Su-Ping Liu, Xu-Long Gong, Guang-Qing Wei
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0ff946b6d1204f70b2c795b6ea964904
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spelling	oai:doaj.org-article:0ff946b6d1204f70b2c795b6ea9649042021-12-02T17:39:19ZMicroanchored borehole fiber optics allows strain profiling of the shallow subsurface10.1038/s41598-021-88526-82045-2322https://doaj.org/article/0ff946b6d1204f70b2c795b6ea9649042021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88526-8https://doaj.org/toc/2045-2322Abstract Vertical deformation profiles of subterranean geological formations are conventionally measured by borehole extensometry. Distributed strain sensing (DSS) paired with fiber-optic cables installed in the ground opens up possibilities for acquiring high-resolution static and quasistatic strain profiles of deforming strata, but it is currently limited by reduced data quality due to complicated patterns of interaction between the buried cables and their surroundings, especially in upper soil layers under low confining pressures. Extending recent DSS studies, we present an improved approach using microanchored fiber-optic cables—designed to optimize ground-to-cable coupling at the near surface—for strain determination along entire lengths of vertical boreholes. We proposed a novel criterion for soil–cable coupling evaluation based on the geotechnical bearing capacity theory. We applied this enhanced methodology to monitor groundwater-related vertical motions in both laboratory and field experiments. Corroborating extensometer recordings, acquired simultaneously, validated fiber optically determined displacements, suggesting microanchored DSS as an improved means for detecting and monitoring shallow subsurface strain profiles.Cheng-Cheng ZhangBin ShiSong ZhangKai GuSu-Ping LiuXu-Long GongGuang-Qing WeiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Cheng-Cheng Zhang Bin Shi Song Zhang Kai Gu Su-Ping Liu Xu-Long Gong Guang-Qing Wei Microanchored borehole fiber optics allows strain profiling of the shallow subsurface
description	Abstract Vertical deformation profiles of subterranean geological formations are conventionally measured by borehole extensometry. Distributed strain sensing (DSS) paired with fiber-optic cables installed in the ground opens up possibilities for acquiring high-resolution static and quasistatic strain profiles of deforming strata, but it is currently limited by reduced data quality due to complicated patterns of interaction between the buried cables and their surroundings, especially in upper soil layers under low confining pressures. Extending recent DSS studies, we present an improved approach using microanchored fiber-optic cables—designed to optimize ground-to-cable coupling at the near surface—for strain determination along entire lengths of vertical boreholes. We proposed a novel criterion for soil–cable coupling evaluation based on the geotechnical bearing capacity theory. We applied this enhanced methodology to monitor groundwater-related vertical motions in both laboratory and field experiments. Corroborating extensometer recordings, acquired simultaneously, validated fiber optically determined displacements, suggesting microanchored DSS as an improved means for detecting and monitoring shallow subsurface strain profiles.
format	article
author	Cheng-Cheng Zhang Bin Shi Song Zhang Kai Gu Su-Ping Liu Xu-Long Gong Guang-Qing Wei
author_facet	Cheng-Cheng Zhang Bin Shi Song Zhang Kai Gu Su-Ping Liu Xu-Long Gong Guang-Qing Wei
author_sort	Cheng-Cheng Zhang
title	Microanchored borehole fiber optics allows strain profiling of the shallow subsurface
title_short	Microanchored borehole fiber optics allows strain profiling of the shallow subsurface
title_full	Microanchored borehole fiber optics allows strain profiling of the shallow subsurface
title_fullStr	Microanchored borehole fiber optics allows strain profiling of the shallow subsurface
title_full_unstemmed	Microanchored borehole fiber optics allows strain profiling of the shallow subsurface
title_sort	microanchored borehole fiber optics allows strain profiling of the shallow subsurface
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0ff946b6d1204f70b2c795b6ea964904
work_keys_str_mv	AT chengchengzhang microanchoredboreholefiberopticsallowsstrainprofilingoftheshallowsubsurface AT binshi microanchoredboreholefiberopticsallowsstrainprofilingoftheshallowsubsurface AT songzhang microanchoredboreholefiberopticsallowsstrainprofilingoftheshallowsubsurface AT kaigu microanchoredboreholefiberopticsallowsstrainprofilingoftheshallowsubsurface AT supingliu microanchoredboreholefiberopticsallowsstrainprofilingoftheshallowsubsurface AT xulonggong microanchoredboreholefiberopticsallowsstrainprofilingoftheshallowsubsurface AT guangqingwei microanchoredboreholefiberopticsallowsstrainprofilingoftheshallowsubsurface
_version_	1718379809025818624

Microanchored borehole fiber optics allows strain profiling of the shallow subsurface

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